

Yes, I think you’re talking about something else, related to your particular needs. But the post OP opened (which you were replying to) was about discussing what “implications for Linux” would the new Steam hardware have.
I feel the only part in your comment that was somewhat relevant to the question raised by OP was:
Anyway IMHO the big questions for VR on Linux more broadly is what changes upstream on KDE in terms of immersive UX? Is KDE Plasma becoming a VR graphical shell? Does it have 3D widgets? Does it impact freedesktop in any way?


Those are open questions that I don’t think we can answer yet.
If you are asking if Valve did make changes there, I’m expecting the answer is likely no. They haven’t shown anything regarding KDE/desktop mode on the Steam Frame. And we have yet to see how exactly this is integrated with gamescope. But if the device does become popular and interest grows for Linux VR development, then I expect we’ll see people trying to make new VR environments for Linux (or adapt existing ones for VR).
However, given that Valve plans to offer ways to play non-VR games with the Frame, I expect one could add a nested wayland session as if it were a non-Steam non-VR game, so in the VR environment from SteamOS one could have a floating screen showing a traditional KDE session relatively easy, I would expect. And in that sense one could have a desktop VR environment standalone, in the Frame.